The Lilac Road Bridge is a reinforced concrete arch bridge in San Diego, California, built in 1978 at a cost of $1,500,000. Its main span is 455 feet (139 m), with a total length of 745 feet (227 m). It was designed by Caltrans architect William Wells. This bridge is one of the two overcrossings in San Diego County with this unique arch design, the other being the Eastgate Mall Bridge.